A Numerical Simulation of Ground Magnetic Field at Total Solar Eclipse on 22 July, 2009 based on Coupled Model
Yuki SAEKI, Yasuhiro MINAMOTO, Shigeru FUJITA and Shingo NAGAMACHI
Abstract
It has been uncertain whether geomagnetic variations are associated with a solar eclipse. The uncertainty may be derived from lack of a reliable numerical model for yielding geomagnetic signatures associated with localized and temporal decrease in ionospheric conductivities occurring in a solar eclipse event. Therefore, by using a newly developed integrated numerical model ? Atmospheric Global Circulation model combined with an ionospheric dynamo model and an ionospheric plasma circulation model ? we perform numerical studies of geomagnetic signatures in 2009 total solar eclipse event. The simulation successfully reproduces geomagnetic Z variations observed at KNY. It is noteworthy that this is the first work in the world that confirms definitely geomagnetic variations caused by a solar eclipse based on a realistic numerical model.
Received 30 November 2010; received in revised form 8 December 2010; accepted 15 December 2010
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